text: var EPSLN = 1.0e-10;
  var msfnz = require('../common/msfnz');
  var tsfnz = require('../common/tsfnz');
  var HALF_PI = Math.PI/2;
  var sign = require('../common/sign');
  var adjust_lon = require('../common/adjust_lon');
  var phi2z = require('../common/phi2z');
  exports.init = function() {
  
    // array of:  r_maj,r_min,lat1,lat2,c_lon,c_lat,false_east,false_north
    //double c_lat;                   /* center latitude                      */
    //double c_lon;                   /* center longitude                     */
    //double lat1;                    /* first standard parallel              */
    //double lat2;                    /* second standard parallel             */
    //double r_maj;                   /* major axis                           */
    //double r_min;                   /* minor axis                           */
    //double false_east;              /* x offset in meters                   */
    //double false_north;             /* y offset in meters                   */
  
    if (!this.lat2) {
      this.lat2 = this.lat1;
    } //if lat2 is not defined
    if (!this.k0) {
      this.k0 = 1;
    }
  
    // Standard Parallels cannot be equal and on opposite sides of the equator
    if (Math.abs(this.lat1 + this.lat2) < EPSLN) {
      return;
    }
  
    var temp = this.b / this.a;
    this.e = Math.sqrt(1 - temp * temp);
  
    var sin1 = Math.sin(this.lat1);
    var cos1 = Math.cos(this.lat1);
    var ms1 = msfnz(this.e, sin1, cos1);
    var ts1 = tsfnz(this.e, this.lat1, sin1);
  
    var sin2 = Math.sin(this.lat2);
    var cos2 = Math.cos(this.lat2);
    var ms2 = msfnz(this.e, sin2, cos2);
    var ts2 = tsfnz(this.e, this.lat2, sin2);
  
    var ts0 = tsfnz(this.e, this.lat0, Math.sin(this.lat0));
  
    if (Math.abs(this.lat1 - this.lat2) > EPSLN) {
      this.ns = Math.log(ms1 / ms2) / Math.log(ts1 / ts2);
    }
    else {
      this.ns = sin1;
    }
    if (isNaN(this.ns)) {
      this.ns = sin1;
    }
    this.f0 = ms1 / (this.ns * Math.pow(ts1, this.ns));
    this.rh = this.a * this.f0 * Math.pow(ts0, this.ns);
    if (!this.title) {
      this.title = "Lambert Conformal Conic";
    }
  };
  
  
  // Lambert Conformal conic forward equations--mapping lat,long to x,y
  // -----------------------------------------------------------------
  exports.forward = function(p) {
  
    var lon = p.x;
    var lat = p.y;
  
    // singular cases :
    if (Math.abs(2 * Math.abs(lat) - Math.PI) <= EPSLN) {
      lat = sign(lat) * (HALF_PI - 2 * EPSLN);
    }
  
    var con = Math.abs(Math.abs(lat) - HALF_PI);
    var ts, rh1;
    if (con > EPSLN) {
      ts = tsfnz(this.e, lat, Math.sin(lat));
      rh1 = this.a * this.f0 * Math.pow(ts, this.ns);
    }
    else {
      con = lat * this.ns;
      if (con <= 0) {
        return null;
      }
      rh1 = 0;
    }
    var theta = this.ns * adjust_lon(lon - this.long0);
    p.x = this.k0 * (rh1 * Math.sin(theta)) + this.x0;
    p.y = this.k0 * (this.rh - rh1 * Math.cos(theta)) + this.y0;
  
    return p;
  };
  
  // Lambert Conformal Conic inverse equations--mapping x,y to lat/long
  // -----------------------------------------------------------------
  exports.inverse = function(p) {
  
    var rh1, con, ts;
    var lat, lon;
    var x = (p.x - this.x0) / this.k0;
    var y = (this.rh - (p.y - this.y0) / this.k0);
    if (this.ns > 0) {
      rh1 = Math.sqrt(x * x + y * y);
      con = 1;
    }
    else {
      rh1 = -Math.sqrt(x * x + y * y);
      con = -1;
    }
    var theta = 0;
    if (rh1 !== 0) {
      theta = Math.atan2((con * x), (con * y));
    }
    if ((rh1 !== 0) || (this.ns > 0)) {
      con = 1 / this.ns;
      ts = Math.pow((rh1 / (this.a * this.f0)), con);
      lat = phi2z(this.e, ts);
      if (lat === -9999) {
        return null;
      }
    }
    else {
      lat = -HALF_PI;
    }
    lon = adjust_lon(theta / this.ns + this.long0);
  
    p.x = lon;
    p.y = lat;
    return p;
  };
  
  exports.names = ["Lambert Tangential Conformal Conic Projection", "Lambert_Conformal_Conic", "Lambert_Conformal_Conic_2SP", "lcc"];
  